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tm.texi (HARD_REGNO_NREGS): Note that this macro must not return zero.

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* doc/tm.texi (HARD_REGNO_NREGS): Note that this macro must not
return zero.

From-SVN: r131703
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DJ Delorie 2008-01-21 17:20:57 -05:00 committed by DJ Delorie
parent 013d0feab1
commit 79e168dac0
2 changed files with 8 additions and 1 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2008-01-21 DJ Delorie <dj@redhat.com>
* doc/tm.texi (HARD_REGNO_NREGS): Note that this macro must not
return zero.
2008-01-21 Richard Guenther <rguenther@suse.de>
PR middle-end/34856

4
gcc/doc/tm.texi
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@ -2079,7 +2079,9 @@ consecutive registers are needed for a given mode.
@defmac HARD_REGNO_NREGS (@var{regno}, @var{mode})
A C expression for the number of consecutive hard registers, starting
at register number @var{regno}, required to hold a value of mode
@var{mode}.
@var{mode}. This macro must never return zero, even if a register
cannot hold the requested mode - indicate that with HARD_REGNO_MODE_OK
and/or CANNOT_CHANGE_MODE_CLASS instead.
On a machine where all registers are exactly one word, a suitable
definition of this macro is